Use only the digits 0 - 9 and the decimal and the negative sign, if needed, to fill in the blank. If f (x) = 2x + 9, then f (-1) =

What is percentage error

What is tangent pi over 2

Between which two consecutive whole numbers does the square root of 7 lie

Molly road her bike 15 3/4 miles in 3/4 of an hour. what was his average speed in miles per hour?

There are 7 trout fish in a pond, and the population doubles every year. Find the population after t years.

Solve for x: 0.8 (5x+15) = 2.6 - (x+3)

An acute angle θ is in a right triangle with sin θ = two thirds. What is the value of cot θ?

Jack read 1/6 of a book on Monday and another 1/3 of it on Tuesday. He took another 4 days to finish reading the book. He read the same number of pages on each of the 4 days.

How many solutions does 25-4x=15-3x+10-x have

A certain measurement must be between 3.64 and 4.28 centimeters. Which number is greater than 3.64 and less than 4.28?